APOB and systemic lupus erythematosus: It is shown that SLEDAI was positively correlated with LDL-c (r = 0.47, P < 0.01), Apo-B (r = 0.4524, P < 0.01), and Apo B/A1(r = 0.4015, P < 0.01) in SLE patients (Fig. 4A).